Improved Measurement of Green's Function in Hybridization Expansion Continuous Time Quantum Monte Carlo.

Abstract: We first briefly introduce the recently developed group of continuous-time quantum Monte Carlo impurity solvers with emphasis on the version based on the hybridisation expansion (CT-HYB). We point out limitations of CT-HYB concerning measurement of the Green's function resulting from the discrete character of its estimators and describe an improved measurement algorithm. Finally, we show benefits of the new measurement method on numerical results.